Fluid relief valve



A. C. ROESSLER FLUID RELIEF VALVE Filed Jan. 10, 1929 Jan. 12, 1932.

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3mm M M www Patented Jan. 12, 1932 l UNITED STATES PATE-NT ori-1ersl AMANDU'SC. ROESSLER, 0F LAKEWOOD, OHIO, ASSIGNOR TO ROMEO CORPORATION, 0F BEAVER FALLS, PENNSYLVANIA, Av CORPORATION OF OHIO Y FLUID RELIEF VALVE A Y Application :tiled .Tanuary 10,l 1929. Serial ivo. 331,447.

This invention relates to spring controlled with the smaller end opening into the cylinrelief valves for fluid pumps or other apparadrical bore of the body 10. n one side of tus wherein excess pressures are apt to be the body 10 is a port 14 which may lead dicreated. v rectly to the atmosphere or the body may De 5 The-fluid relief valves now in use have provided with an attaching portion 1 5 for u several objectionable features, such as chatconnectionwith thefvacuum or low pressure tering and pounding during operation, lack side of the pump, compressor or the like. lof sensitiveness `to small differences of pres- Slidably received 1n .the cylindrical bore sure, and they are unreliable in their operaof the body is the valve member lwhich 10 tion. Chattering is usually caused when the isg'in the form of a tube open at its endsbut 60 valve is only partly open and there is only closed intermediate itsends bya wall or parenoughpressure against the spring `to cause tition 17. On the one side of the partition an alternate seating and `unseating of the 17 the wall of the tube is provided with apervalve in a rapid succession of impulses against tures 18. The inner Wall of the other end of its seat. The pounding is due to the quick the tube 16 is provided, adjacent the parti- 65 release of pressure inthe line. Lack of sention 17, with an annular groove'19. As will sitiveness is usually due to the length of the be I10ted the bOre at the ends 0f the tubular spring whic is usually quite short. Unrevalve 16 are tapered as at 20 and 21. Reliability is often due to the valve beating Ceived Within the end 0f the valve member 20 down on its `seat, and when placed between and having its end enlarged and received in 70 the discharge and suction end of the lines the annular groove 19 1s a coil spring 22. of a pump, the suction tends to keep the valve Attachedto the other end of the spring 22 oiil its seat thus preventing it fromclosing 1S a-11 adjusting Screw 23 having enlarged properly. end 23a and integral collar 23b betw n which 25 The Object; 0f my invention is to provide a a coil of the sprlng is secured, sa1d/edjusting 75 relief valve which has none of the above men- SCIQ'W being threaded through the plug L11 tioned objectionable features, and more pa-rwhich closes the end of the body 10. To reticularly to provide a relief valve which will tain the adjusting screw in any desired posibe silent in operation, and which will opertion in the 'plug 11 the lock nut 24 is provided.

80 ate effectively under small pressure varia- Encasing the end of the adjusting screw and 80 tions. lock nut is a cap nut 25 which screws on the With these and other objects-in view, my Outer end of 'the plug 11 and forms a c011- invention resides in the various novel featnllatioll 0f the body 1 0- The Valve 16 flOl'll tures of construction and combination, all of t e apertures 18 to the end on the other side ibed and pointed of the partition 17 is of a lsufficient length to 85' which are hereinafter descr out in the appended claims. provide a good sliding bearing surface in the In the drawings Fig. 1 is a sectional elevabody 10 and to close the outlet port 14.

tion of my improved relief valve; Fig. 2 is The spring is adjusted so that the valve a sectional elevation of a pump with the recloses the port 14, as shown 1n the figure and 40 lief valve formed as an integral part thereof. it will be noted that the valve end doesnot 90 in the drawings, 10 designates the body of under no tension will not deteriorate as rapthe valve which is tubular in form with a idly as a spring which isnormally comcylindrical bore, one end is internally threadpressed or extended and its resiliency will 95 ed and is closed by the threaded plug 11. remain practically constant. It will be noted The other end 12 is externally threaded for that the spring 22 which is secured in the attaching the same to the pressure lineor piston valve 16 acts as a tensionl spring when side of the pump. The end 12 has a tapered the valve is forced to the right pastits nor- 'D bore 13 providing a funnel shaped passage mal position due to asudden drop of pressure lo may have found its way into the at 13. The tapered bore in the end of the body at 13 and the tapered end 21 of the valve direct any foreign matter that may enter the valve under the pressure of the fluid to the center of the member 16, and tends to prevent its getting between the valve member 16 and the casing 10. To permit communication between the spring chamber 26 and the outside atmosphere, or the lower pressure side of the pump, the casing 10 is provided on its inner wall with a passage 27 leading from the port 14 to the closed end of the spring chamber.

The valve may be used in any position and Iwhen used in a vertical position with the inlet 12 up, the spring need not be secured to` the valve sleeve or the adjusting .screw although the arrangement shown is to be preferred.

The valve may also be built integral with the pump as shown in Fig. 2, in which the discharge port is indicated at 40, the inlet or suction port at 41, and the valve chamber at 42, with the valve member 48, spring 44,

adjusting screw 45, plug 46 and cap 47 all arranged in the manner set forth in the description of Fig. 1.

The operation of the valve will be apparent. The inlet end 12 is attached to the discharge or pressure side 0f the pump atvany convenient point, the outlet 15 is connected to the low pressure or suction side of the pump or to any other place where it is desired to de* liver the discharge, such as a storage tank, or simply 'to the atmosphere. The adjusting screw 23 is set to allow the valve to open at the desired pressure. lVhen the pressure of the fluid in the pressure line becomes greater than the predetermined pressure the valve member 16 is urged to the left against the pressure of the 'spring until the openings 18 communi cate with port 14 and the fluid escapes through the outlet at 14. Any fluid which chamber 26 passes out through the channel 27 to the outlet 14. When the pressure in the line goes down the spring urges the valve member to its original position over the outlet 14. Any tendency of the member 16 to go further is overcome by the spring 22 which then acts as a tension spring. When the outlet 14 is connected to the suction line there is no tendency of, the suction to keep the valve open as in the case of valves which are urged against a valve seat.

It is apparent that since there is no valve seat there will be no pounding or chattering when the valve'is in operation.

Having thus described my invention, what I claim is 1. A fluid relief valve comprising a casing member having a cylindrical bore, with an inlet port communicating with the high pressure end of said bore, and an outlet port on one side of said casing, a. closure for the low .pressure end of said casing, an adjusting tition forming sockets in the ends thereof, the

socket on the low pressure end of said piston receiving the other end of said spring, there being apertures in the Wallof the socket portion of the piston on the high pressure end, the piston adapted to be held by the spring in a position in the bore of the casing normally closing the outlet port, the apertures in the pressure end of the piston adapted to communicate with the outlet when the piston is moved against the pressure of the spring by the pressure of the fluid in the inlet side of the casing.

2. A fiuid relief valve comprising a cylindrically bored casing member, an inlet communicating with the bore at one end of said casing, and arranged concentric therewith, the bore of said inlet being tapered inwardly from its outer end and of a diameter less than the diameter of the bore of the casing, a piston member slidably received in said casing, said piston having a socket in each end, the pressure end having cut-out portions, the ends being counterbored to provide tapering edges, a spring received in the socket in the low pressure end, a closure in the low pressure end of said casing against whichthe opposite end of the spring bears, the casing being provided with an outlet port on its side normally closed by said piston member, the apertures in the pressure end of said piston communicating with the outlet when the piston is moved toward the low pressure end of the casing under the pressure of the uid in the high pressure end, thereby allowing the fluid to pass out of the outlet until the pressure is reduced.

3. A fluid relief valve comprising a casing having a cylindrical bore extending therethrough, an apertured plug threaded in one end of said bore, an adjusting screw threaded through the aperture in said plug, the plug extending outwardly from said casing, a cap threaded thereon constituting a closure for said adjusting screw, a spring secured to the inner end of said screw, a slidable piston snugly litting in the bore of said casing, said piston having a socket receiving the free end of said spring, the casing being provided with an inlet port in the end of said cylinder and an outlet port at one side of said cylindrical bore and intermediate the ends thereof, said outlet being normally closed by said piston when the same is held against the spring by the pressure at the inlet end of said casing, said piston adapted to be pressed toward the closed end of the casing by the fluid when a predetermined pressure is exceeded whereby the outlet is opened until the pressure is reduced, thecasing being provided Wh means to prevent a pressure from I )eing 5 when the piston is moved toward the low pressure end thereof. l

In testimony whereof, I hereunto affix my signature.

m AMANDUS C. RoEssLER. 

